Comparison of Ultrasound-Assisted and Regular Leaching of Vanadium and Chromium from Roasted High Chromium Vanadium Slag
| Autor: | Jing Wen, Xiaole Zheng, Hui-yang Gao, Tao Jiang, Xiang Xin Xue, Yajing Liu |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Metallurgy General Engineering Vanadium chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure Ultrasound assisted 01 natural sciences 0104 chemical sciences Chromium chemistry Mass transfer Ultrasonic cavitation General Materials Science Leaching (metallurgy) 0210 nano-technology Roasting |
| Zdroj: | JOM. 70:155-160 |
| ISSN: | 1543-1851 1047-4838 |
| Popis: | Ultrasound-assisted leaching (UAL) was used for vanadium and chromium leaching from roasted material obtained by the calcification roasting of high-chromium–vanadium slag. UAL was compared with regular leaching. The effect of the leaching time and temperature, acid concentration, and liquid–solid ratio on the vanadium and chromium leaching behaviors was investigated. The UAL mechanism was determined from particle-size-distribution and microstructure analyses. UAL decreased the reaction time and leaching temperature significantly. Furthermore, 96.67% vanadium and less than 1% chromium were leached at 60°C for 60 min with 20% H2SO4 at a liquid–solid ratio of 8, which was higher than the maximum vanadium leaching rate of 90.89% obtained using regular leaching at 80°C for 120 min. Ultrasonic waves broke and dispersed the solid sample because of ultrasonic cavitation, which increased the contact area of the roasted sample and the leaching medium, the solid–liquid mass transfer, and the vanadium leaching rate. |
| Databáze: | OpenAIRE |
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